David,
Wouldn't the simple solution be to check with your local police?
I wear a fake sgian dubh most times I'm out and about, and save the nice oxhorn real* one I bought from the Scottish Tartan Museum for dress up occassions. That way I don't ever have to worry about it. Truth be told I think hardly anyone ever even notices the handle's presence be it knife or bottle cap opener.
Cheers
* The blade while shiny and nice looking is best suited for defending one's person from a piece of vicious Brie or perhaps a savage bit of Stilton.
-See it there, a white plume
Over the battle - A diamond in the ash
Of the ultimate combustion-My panache
Edmond Rostand
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